OPSWAT - OPSWAT offers an advanced threat detection and prevention platform.
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Forcepoint Web Security Suite - Internet Security
Better Uptime - We call you when your website goes down